Machine for threading pipe



"Se t. 22. 1925'. 1,554,384-

J. STEINMETZ momma FOR THREADING PIPE Filed March 17, 1924 7 sSheets-Sheet 1 I N VEN TOR. .JZILIZB STLWIETZ BY A TTORNEYS.

Sept. 22, 1925; w 1,554,384

J. STEINMETZ MAHINE FOR THREADING PIPE Filed March 17, 1924 3Sheets-Sheet 2 FFL1%.II

IN VEN TOR. JULIZIE' 575m ETZ' BY I - A TTORNEYS.

Sept. 22, 1925; 1,554,334

. J. STEIN M ETZ MACHINE FGR THREADING PIPE Filed March 1'7. 1924 sSheets-Sheet 3 FIEr V] mar-V is L v 1 x 1 *N a k v i g N g i w E k IINVENTOR.

JZ/Zll/S arm /M572 ATTORNEYS.

Patented Sept. 22, 1925.

* UNITED srariss PATENT OFFICE.

JULIUS STEINMETZ, OF SAN FRANCISCO, CALIFORNIA.

maonmr. son 'rnnnanme PIPE.

Application filedlttarch 17, 1924. Serial No. 699,658.

following is a specification.

The present invention relates to an improved machine for threading theends of such piping to provide for the joining of the piping. 7

An object of the invention is to provide a screw joint for sheet metalpiping wherein the ends of the piping'telescope one another and may bequickly and easily connected 7 with a comparatively tight joint whichwill not readily loosen.

Another object is to provide for a joint of the character describedbetween sections of pipe of the same diameter, theformation of thethreads in the ends of the pipe being such as to constrict one end andexpand the other, whereby the constricted end may be a of the specialmachine shown in Figs. 1, 2

screwed into the expanded end.

Another object of the invention is to pro vide a machine of a small,compactv and simple construction, which machine may be easily andexpeditiously operated to thread the pipe and shape the ends toprovide-for the joint of this invention, theoperation of threading andexpanding, or threading and constricting the pipe ends being simultalVith the above mentioned and otherhereinafter described,'illustrated inthe accompanying drawings, and set forth in the claims hereto appended,it being understood that various changes in the form, proportion, sizeand minor details of construction within the scope of the claims may be.re-

sorted to without departing from the spirit or sacrificing any of theadvantages of the invention. 7 T 1 Referring to the drawing: Fig. 1represents a si machine of the invention;

Fig. 2 represents an enlarged longitudinal sectional View of themachine; 5

Fig. 3 representsa side elevation of the threading dies as when arrangedto expand and thread a pipe end, showing the. pipe'in place between thedies;

Fig. 4 s a view similar to Fig. 3, showing de elevation of thethreadedand constricted or reduced ends respectively designated 3 and 4and the end 4 is turned into the end 3 to provide for joining the pipeas shown in Fig. 5.- This joint may be as quickly established as theordinary stove pipe joint but will be more secure and tighter owing tothe threads. The pipes l and 2 are of the same diameter except at theirends where for example, one

end of the pipe will be expanded and threaded and the other reduced.

The reducing and enlarging of the ends is provided for by the threadingdies 5 and 6 'the shaft 10 is screwed onto the end 8 and holds the otherdie in place. The threading members or ribs 13 of the die 5 are thinnerand have sharper edges than those 141 of the die 6 and when said die.5.is located above the die 6 (see Fig. 3) the pipe will be expanded orenlarged at its end as well as threaded, whereas, when in the reverseposi- 7 .tion as shown in Fig. 41, the end of the pipe will beconstricted or reduced where threaded. The dies n bemg' removable orinterchangeable in the shafts may be quickly and easily reversed as toposition to form the special joint ends 011 the pipes. The shafts 9 and10 are suitably journaled in a frame 15 mounted on a standard 16 hav-'ing a clamp 17 at its lower end. The clamp gear 20 thereon meshing witha similar gear 21 fixed to the shaft 10 wherebywhen'the crank is turnedthe shafts and dies rotate in opposite directions. The shaft 9 extendsthrough a pivoted bearing 22 near its crank 'is provided to attach themachine to a bench -or like support 18. The shaft 9 has an operatingcrank 19 attached thereto and has a means 23 including a crank 24 isassociated with the bearing 22 and provides for tilting the shaft toraise and lower the die on the upper shaft and thereby set thediesfordifferent kinds of work."The"shaft is threaded as at 25 andactuates a threaded block 26 which is carried by a sliding carriage 27supported on-the shaft. Theblock is yieldingly held in contact with thethreadlu ed" portion of the shaft by an expansion "spring 28 surroundinga stem 29 which depends from the block. A casing 30 depending thefrom'thecarriage houses the stem and spring. The stem 29 projects outthrough the lower end of the casing 30 and has a crank arm 31 heldthereon by means' -of a set screw 32, the spring "abutting the crankarm. A' collar 33 is mounted on the cs'teni below the crank arm and isheld inplace by a set screw 34. Connected with the iouter end of thecrank arm is a-rod 35slidably mounted in an extension 36 in the frame15. Adjustable stop members 37 and 38 are -fi'xed to the rod 35 onopposite sides of the extension 36;As'the shaft 10 revolves the screwthreaded portion 25 operating on the "block 26 carried by'the carriage27 causes the latter to tr'avel forwardly and therod 35. is "pulled inthefsame direction until the stop 38is'encountered' and the movement ofthe rod is arrested. The crank arm has a *V shaped "projection39'--engagin-g in a simi-- lar're'cess eO'pi'ovided in theeasing 30 and4 as tlie 'carriage advances, the'V-shaped member 39 is pulled out ofthe recess 40 and causes the stem '29 topull downward therebymoving thescrewblock out of engage- -mei'itwith the screw threadedportion 25 oftheshaft 10. This means'regul'ates the feed-' ning action ofthe'carr-iage and its'a'ssociated parts and may beset to causethexzarriage and said" parts 'to-feed forwardly to the 6X' tent desired.An abutment plate4al depends -"fro1n the carriage 27' and is'adapte'd tobe 'sengaged' by the pipe to be operated. upon.

#A' rod 42 paralleling the extension 12'and #"eXten'ding from thecarriage, serves with the? *"GXtGhSLOlhfiS a support forrthet'pipe. A'center1ng disk 43 1S shdably 'mo unted upon Withe extension 12"androd42"and holds the i'pip'ein proper position to betreated inthe' machine.I

The'operation of the'machine is as follows: "The pipe to be treated ismounted upon the ex'tension'12'and rod 42 around the "centering diskandone end is pushed between thedies which are separated'or moved apartthrough operation of the adjusting crank 19 is then turned so 'astorevolve'the shaft '10 in a mannerwhich will withdraw or pullinwa'rdly onthe carriage or abutmentpla'te 42. If the thread is to'extend OVeradistance of three inches from the end of the pipe, thestop members 37and 38 are means o3,'to lift'upon the bearing 22. The

set and therefore held, three inches apart,

taking into consideration the thickness of the extension 6. When the endof the pipe is engaged with the retracted abutment plate 41, theoperatorturns the crank 24 and lowers the shaft 9 to clamp the pipe between thedies 5 and 6. The depth of the thread maybe-regulated by the position ofthe two dies relative to one another. Vith the dies thus set :theoperator then rotates the "crank in the opposite direction so asto-cause "the carriage to travel-forwardly or zout- -wardly, the diesthus engage-the pipe at a "distance several inches from the end andwhile the dies are rotating, the pip'eis being i "pushedoutwardly by theaction o'f'the'carriage so that a spiral'screw is formed in the :pipe.When-the die 5', beingthe'one with the thick edged screw' formingelements 13, isyuppermost the end of the-zpipe being threaded isexpanded or enlarged as shown in Fi'g. 33 The pipe is taken offend the"other end' placecbbetween the dies and' the operationrepeated butwiththe dies reversed sheet 'metalpiping, comprising circular dies eachconsisting of a plurality of ribs of dif -fere'nt thicknesses, means forrOtatably-supporting said dies one above the other,- means forsupporting pipe engaged between-said dies, and means moving the piperelative to the-dies-during rotation of'the'dies to form spiralthr'eadsonrotation of said dies. 2. Aunachine for threading the ends of sheetmetal piping; comprising circular dies each consisting of a-plurality ofribs of different thicknesses, means for rotatablyl supporting'said diesone above the other, means for supporting fpipe engaged-between said-=dies, means moving the piperelative'to the dies during rotation ofsaid dies, and means for adjusting said 'diestowards and away from oneanother to provide for-insertion of the pipe between the dies and to-regulatetherdepth of the threads.

3. A machine for forming threadsatthe ends of sheet" metal' piping,comprising rotary dies mountedone above the other, rotary members onwhich the dies areinterchangeably mounted, said dies being of differentthicknesses providing when in one position a constrlcting of the pipebeing threaded and when inranother position the expansion of the pipebeing threaded, and means for rotating the dies.

4:. A machine for forming threads at the ends of sheet metal piping,comprising rotary dies mounted one above the other, rotary members onwhich the dies are interchangeably mounted, said dies being of differentthicknesses providing when in one position a constricting of the pipebeing threaded and when in another position the expansion of the pipebeing threaded, means for rotating the dies, and means moving the piperelative to the dies during rotation of said dies, 7

5. A machine for forming threads in the ends of sheet metal pipe,comprising rotary dies mounted opposite one another having their threadforming elements of differing thicknesses, means for rotatablysupporting said dies, members on which said dies are removably mountedto provide for reversing the positionsof the dies, means for supportingpipe between the dies, means moving the pipe during rotation of thedies, means for moving the dies towards and away fromone another, andadjustable stop means for regulating the extent of movement of saidpipe.

6. A machine for forming threads in the ends of sheet metal pipe,comprising rotary dies mounted opposite one another, rotatablesupporting means on rotation of said screwthreaded shaft, and means forsimultaneously rotating the die supporting shafts.

JULIUS STEINMETZ.

